A tennis player tosses a tennis ball straight up in the air If $a$ is the

acceleration of the ball, and $v$ is its velocity, which statement is true for

when the ball reaches the highest point of its trajectory? Show your

work

A$.$ Both $v$ and a are zero

B$.$ Only $v$ is zero and $a$ is not

C$.$ Only $a$ is zero and $v$ is not

D$.$ Both $v$ and a are non$-$zero

E$.$ Impossible to answer without knowing the initial speed of the ball